Imagine having the     1     to sing together with hundreds of other people while you are at home alone. You can do this in a virtual choir. Virtual choir members     2     themselves while they perform alone on video. These videos are     3     onto the Internet, and then they are put together into one video that you can see online - a virtual choir. Anyone can take part in a virtual choir from anywhere - all you need is a video     4     and an Internet connection. You do not even need a     5    .